The **2SC5027-R-TA3-T** is a high-voltage, high-speed switching NPN power transistor. It is primarily designed for use in switching regulators, ultrasonic generators, and high-frequency power amplifiers. --- ### 1. Key Technical Specifications The following table highlights the absolute maximum ratings and electrical characteristics for this specific part: | Parameter | Symbol | Rating | Unit | | :--- | :--- | :--- | :--- | | **Collector-Base Voltage** | $V_{CBO}$ | 1100 | V | | **Collector-Emitter Voltage** | $V_{CEO}$ | 800 | V | | **Emitter-Base Voltage** | $V_{EBO}$ | 7 | V | | **Collector Current (DC)** | $I_C$ | 3 | A | | **Collector Dissipation ($T_c=25^\circ C$)** | $P_C$ | 40 | W | | **DC Current Gain** | $h_{FE}$ | 15 - 30 (R Rank) | - | | **Storage Temperature** | $T_{stg}$ | -55 to +150 | $^\circ C$ | --- ### 2. Part Number Breakdown The suffixing in the part number provides specific information about the packaging and electrical sorting: * **2SC5027**: The base model (NPN Silicon Transistor). * **-R**: Represents the **hFE (DC Current Gain) rank**. The "R" rank typically falls between 15 and 30. * **-TA3**: Indicates the **Package Type**. In this case, it usually refers to the **TO-220** package. * **-T**: Usually signifies the packing method, such as **Tube** (as opposed to Tape & Reel). --- ### 3. Functional Features * **High Voltage Capability**: With an 800V $V_{CEO}$, it is suitable for power supplies connected to 220V/240V AC lines. * **High Speed**: Optimized for fast switching transitions to reduce power loss in SMPS (Switched-Mode Power Supplies). * **High Reliability**: Designed to handle significant inductive loads and high thermal stress. --- ### 4. Typical Applications 1. **Switching Regulators**: Used as the primary power switch in AC-DC converters. 2. **High-Frequency Inverters**: Suitable for induction heating or ultrasonic cleaning circuits. 3. **Deflection Circuits**: Found in older CRT monitors and televisions. 4. **Lighting Ballasts**: Electronic ballasts for fluorescent lamps. --- ### 5. Terminal Connection (TO-220) Looking at the front of the transistor (labeled side), the pins are typically: 1. **Base (B)** 2. **Collector (C)** 3. **Emitter (E)**